kaptcha验证码的使用（转）

使用kaptcha可以方便的配置：

 

• 验证码的字体
• 验证码字体的大小
• 验证码字体的字体颜色
• 验证码内容的范围(数字，字母，中文汉字！)
• 验证码图片的大小，边框，边框粗细，边框颜色
• 验证码的干扰线(可以自己继承com.google.code.kaptcha.NoiseProducer写一个自定义的干扰线
  )
• 验证码的样式(鱼眼样式、3D、普通模糊……当然也可以继承com.google.code.kaptcha.GimpyEngine自定义样式)

……

详细信息请看下面的web.xml文件

下面介绍一下用法:

1.首先去官网下载jar:​​http://code.google.com/p/kaptcha/​​

2.建立一个web项目，导入kaptcha-2.3.jar到环境变量中。

3.配置web.xml文件

 

<!-- Kaptcha验证码配置 -->

<servlet>

<servlet-name>Kaptcha</servlet-name>

<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>

<init-param>

<param-name>kaptcha.border</param-name>

<param-value>no</param-value>

</init-param>

<init-param>

<param-name>kaptcha.border.color</param-name>

<param-value>105,179,90</param-value>

</init-param>

<init-param>

<param-name>kaptcha.textproducer.font.color</param-name>

<param-value>red</param-value>

</init-param>

<init-param>

<param-name>kaptcha.obscurificator.impl</param-name>

<param-value>com.google.code.kaptcha.impl.FishEyeGimpy</param-value>

</init-param>

<init-param>

<param-name>kaptcha.image.width</param-name>

<param-value>250</param-value>

</init-param>

<init-param>

<param-name>kaptcha.image.height</param-name>

<param-value>90</param-value>

</init-param>

<init-param>

<param-name>kaptcha.textproducer.font.size</param-name>

<param-value>70</param-value>

</init-param>

<init-param>

<!-- String kaptchaExpected = (String) session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);  
                     必须改成
                    String kaptchaExpected = (String) session.getAttribute("code"); -->
            <param-name>kaptcha.session.key</param-name>

<param-value>code</param-value>

</init-param>

<init-param>

<param-name>kaptcha.textproducer.char.length</param-name>

<param-value>4</param-value>

</init-param>

<init-param>

<param-name>kaptcha.textproducer.font.names</param-name>

<param-value>宋体,楷体,微软雅黑</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>Kaptcha</servlet-name>

<url-pattern>/kaptcha</url-pattern>

</servlet-mapping>

 

4. jsp 页面使用

 

<form class="m-t" role="form"  id="loginform" method="post" action="">

<div class="form-group"><input class="form-control"  name="userAccount" placeholder="用户名" required=""></div>

<div class="form-group"><input type="password" class="form-control"   name="userPwd"  placeholder="密码" required=""></div>

<input type="text" class="form-control login-yan-w" id="kaptcha" name="kaptcha" placeholder="验证码">

<span class="login-w"><img id="kaptchaImage" src="kaptcha"></span>

<input type="button"  class="btn btn-primary block full-width m-b" onclick="login()"  value="登 录">
            </form>

 

function login(){

$.ajax({

cache: true,

type: "POST",

url:'${pageContext.request.contextPath}/login',

data:$('#loginform').serialize(),

dataType:'json',

success: function(data) {

if(data.status==200){

url="<%=request.getContextPath()%>/index.jsp";

window.location.href=url;

}else{

alert(data.msg)

}

},

error: function(){

alert("请检查用户账户或密码");

}

});

}

5. 如果想设置点击图片更换验证码，可以加上如下js

<script type="text/javascript">
    //点击图片验证码进行更新

$(function(){

$('#kaptchaImage').click(function () { $(this).attr('src', 'kaptcha?' + Math.floor(Math.random()*100) ); })

});

</script>

5. KaptchaServlet会把验证码设置到session中，在Controller可以如下方式获取

 

@RequestMapping("/login")
@ResponseBody

public CRMResult  login(HttpServletRequest request ,HttpSession session) {

String kaptcha = request.getParameter("kaptcha");

String kaptchaExpected = (String) session.getAttribute("code");

System.out.println(kaptcha +"......"+kaptchaExpected);

if (!kaptcha.equalsIgnoreCase(kaptchaExpected)) {

return CRMResult.build(201, "验证码填写错误");

}

return CRMResult.ok();

}

上面的配置在普通jsp环境下面是有效的，如果在spring mvc环境下，则取不到session值，对于sping mvc环境验证码配置如下：

１.不用在web.xml进行相关配置，在springmvc.xml中配置

 

<bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">

<property name="config">

<bean class="com.google.code.kaptcha.util.Config">

<constructor-arg>

<props>

<prop key="kaptcha.border">no</prop>

<prop key="kaptcha.border.color">105,179,90</prop>

<prop key="kaptcha.textproducer.font.color">red</prop>

<prop key="kaptcha.image.width">250</prop>

<prop key="kaptcha.textproducer.font.size">90</prop>

<prop key="kaptcha.image.height">90</prop>

<prop key="kaptcha.session.key">code</prop>

<prop key="kaptcha.textproducer.char.length">4</prop>

<prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>

</props>

</constructor-arg>

</bean>  
        </property>

</bean>

 

 

Java代码  

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;

import com.google.code.kaptcha.Producer;

@Controller

@RequestMapping("/")

public class CaptchaImageCreateController {

private Producer captchaProducer = null;

@Autowired

public void setCaptchaProducer(Producer captchaProducer) {

this.captchaProducer = captchaProducer;

}

@RequestMapping("/captcha-image")

public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {

response.setDateHeader("Expires", 0);

// Set standard HTTP/1.1 no-cache headers.

response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");

// Set IE extended HTTP/1.1 no-cache headers (use addHeader).

response.addHeader("Cache-Control", "post-check=0, pre-check=0");

// Set standard HTTP/1.0 no-cache header.

response.setHeader("Pragma", "no-cache");

// return a jpeg

response.setContentType("image/jpeg");

// create the text for the image

String capText = captchaProducer.createText();

// store the text in the session

request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

// create the image with the text

BufferedImage bi = captchaProducer.createImage(capText);

ServletOutputStream out = response.getOutputStream();

// write the data out

ImageIO.write(bi, "jpg", out);

try {

out.flush();

} finally {

out.close();

}

return null;

}

}

 前台调用方式

 

<div class="chknumber">  
       <label>验证码：          
       <input name="kaptcha" type="text" id="kaptcha" maxlength="4" class="chknumber_input" />

</label>

<img src="/ClinicCountManager/captcha-image.do" width="55" height="20" id="kaptchaImage"  style="margin-bottom: -3px"/>   
       <script type="text/javascript">

$(function(){

$('#kaptchaImage').click(function () {//生成验证码

$(this).hide().attr('src', '/ClinicCountManager/captcha-image.do?' + Math.floor(Math.random()*100) ).fadeIn(); })      
                  });

</script>   
     </div>

 

 取验证码的方式

 

String code = (String)session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

 

如果需要全部数字

 

<init-param>

<param-name>kaptcha.textproducer.char.string</param-name>

<param-value>0123456789</param-value>

</init-param>

 

去掉干扰线

 

<init-param>

<param-name>kaptcha.noise.impl</param-name>

<param-value>com.google.code.kaptcha.impl.NoNoise </param-value>

</init-param>